EP1881264A1 - Optical module for headlights of an automobile - Google Patents

Abstract

The module (P) has an additional module (A) including a light source i.e. LED (9), and a lens (10) placed in front of the LED for producing a complementary beam which provides a full beam when combined with a slanted cut off beam i.e. fog-light beam. The module (A) includes a hyperbolic light-recovery reflector (M) rotated forwards and upwards. The LED is placed with respect to a focal point of the reflector, so that a part of light rays from the LED is reflected by the reflector along a rising direction for creating a floodlight in the full beam. An independent claim is also included for an assembly of optical modules comprising a slanted cutting module.

Description

The invention relates to an optical module, in particular intended to be integrated into a motor vehicle headlamp, with a substantially horizontal optical axis, of the type of those which comprise at least one module to give a cut-off beam, in particular an oblique beam of the type code or flat type anti-fog beam, this module comprising at least a first light source having at least one light emitting diode.

A beam optical module of this type is described and claimed in the patent application FR 06 03062 filed April 06, 2006. Such a module may include rows of superposed modules so that the transverse size of the projector is relatively small for a high luminous flux.

The expressions: front, front, rear, etc ... are to be understood by considering the direction of propagation of light forward from the module.

The invention aims to introduce into a module as defined above a road function that not only ensures regulatory road lighting but, moreover, gives a mood light, without substantially changing the size of the module also well in the transverse than longitudinal direction.

• ledit module intègre aussi au moins un module additionnel avec au moins une deuxième source lumineuse formée par au moins une diode électroluminescente éclairant vers l'avant et une lentille située en avant de la deuxième source pour produire un faisceau complémentaire qui, combiné avec le faisceau à coupure, donne un faisceau route,
• et le module additionnel comprend un réflecteur récupérateur de lumière tourné vers l'avant et vers le haut, ce réflecteur récupérateur comportant au moins un foyer, et la deuxième source lumineuse est située par rapport à ce foyer de telle sorte qu'au moins une partie des rayons lumineux provenant de la source sorte du module est réfléchie par le réflecteur récupérateur de lumière suivant une direction ascendante par rapport à l'horizontale notamment pour créer une lumière d'ambiance dans le faisceau route.

The optical module according to the invention for a motor vehicle headlamp, has a substantially horizontal optical axis, and comprises at least one module for providing a cut-off beam, this module comprising at least a first light source comprising at least one light-emitting diode, and such as:

• said module also integrates at least one additional module with at least one second light source formed by at least one forward-illuminating light-emitting diode and a lens located in front of the second source to produce a complementary beam which, combined with the beam cutoff, gives a road beam,
• and the additional module comprises a light recovery reflector facing forward and upward, this recuperating reflector having at least one focus, and the second light source is located with respect to this focus so that at least a portion light rays coming from the source so the module is reflected by the reflector light recuperator in an upward direction relative to the horizontal in particular to create a mood light in the beam.

It is understood by "substantially horizontal" that the optical axis is generally not absolutely horizontal, once the module integrated in the vehicle, but slightly inclined towards the ground, 0.5 ° for example relative to the horizontal.

"Cut-off beam" is understood to mean any beam that differs from a road-type beam by a cut-off, which comprises at least one oblique part (as is the case with European or American code-type beams), or which is flat (as is the case with anti-fog beams).

Preferably, the lens works partly in direct light emitted by the second light source and partly in indirect light emitted by the second light source and reflected by the light-recovering reflector

According to one embodiment, a first portion of the rays emitted by the second light source is reflected by the light-collecting reflector and then passes through the lens and a second portion passes directly through said lens.

Optionally, a third portion of the rays emitted by the second light source is reflected by the light recovery reflector (M) and leaves the module avoiding the lens.

The light-recovering reflector can transform a substantially spherical light wave into a substantially cylindrical or toric light wave.

Alternatively, the light-recovering reflector is of a substantially hyperbolic type and capable of transforming a substantially spherical wave into another substantially spherical wave.

According to a first variant, the portion of the light rays coming from the source reflected in an upward direction relative to the horizontal to create a mood light in the beam emerges from the module through the lens.

According to a second variant, the portion of the light rays coming from the source and reflected in an upward direction relative to the horizontal to create a mood light in the beam emerges from the module avoiding the lens, including passing over of the lens.

It is also possible to have an intermediate variant where this part of these reflected rays comprises a portion passing through the lens, and another portion not passing through the lens.

• un premier réflecteur placé devant la première source lumineuse pour la masquer et pour renvoyer la lumière vers l'arrière,
• et un deuxième réflecteur décalé par rapport à la source lumineuse et au premier réflecteur, ce deuxième réflecteur recevant la lumière réfléchie par le premier réflecteur et la renvoyant vers l'avant pour donner le faisceau à coupure oblique,
• et la deuxième source lumineuse est en dehors de l'espace en regard du premier réflecteur.

According to one embodiment, the first source for example illuminates forwards and the oblique beam module comprises:

• a first reflector placed in front of the first light source to mask it and to send the light backwards,
• and a second reflector offset from the light source and the first reflector, this second reflector receiving the light reflected by the first reflector and returning it forward to give the oblique cut beam,
• and the second light source is outside the space facing the first reflector.

It is understood by "outside the space opposite the first reflector" the fact that the second light source is not opposite this reflector, the fact that the second source can not illuminate the reflector by its positioning relative to this reflector.

The invention also relates to any set of optical modules several obliquely cut modules transversely juxtaposed, the or each additional module being located in a neutral band in front of obliquely cut modules, this neutral band being included vertically between the upper and lower limits of oblique cut modules.

This set of optical modules may advantageously comprise several first light sources and several second light sources arranged in staggered relation to the first light sources of the oblique cut modules.

Preferably, the forward-facing light-recovering reflector is vertically offset relative to the lens.

Advantageously, all the light-emitting diodes of the module or of the set of modules are situated in the same plane: concretely, the or each light-emitting diode of the additional module is disposed on the same printed circuit as the other light-emitting diode (s) of the module

The first and second light sources can be tilted to illuminate upward while illuminating forward.

According to one variant, the upper part of the lens is truncated for the passage of the rays of the ambient light. The recuperating reflector is then preferably of the paraboloid type, located higher than the lens, and the focus of the reflector is located near the lower edge of the source bright so that the points of the source located higher than the focus give ascending rays after reflection on the recuperating reflector.

According to one variant, the upper part of the lens comprises a zone for the passage of the rays of the ambient light. In this case, the recuperating reflector is preferably of the paraboloid type too, located higher than the lens, and the focus of the reflector is located in the vicinity of the lower edge of the light source so that the points of the source situated higher than the focus give ascending rays after reflection on the recuperating reflector.

Alternatively, the recuperating reflector is of the ellipsoidal type with a first focus located on the second light source and a second focus located forward in the air. In this case, the lens preferably has an additional lens in the upper edge zone. This additional lens advantageously has an outer face in continuity with that of the lens while its inner face is determined so that the focal point of the additional lens is coincident with, or adjacent to, the second focus of the recuperating reflector.

This "extra" lens is to be understood either as a lens associated / contiguous to the main lens, or as an extension of the main lens with which it is one.

When the recuperating reflector is of ellipsoidal type, it may be determined to give a horizontal focal line substantially orthogonal to the optical axis leading to a cylindrical wave surface of horizontal transverse axis, while the additional lens is determined to transform this wave surface in a cylindrical wave surface of vertical axis.

The recuperator reflector of ellipsoidal type can then be connected to the lens by a plate at the top to form a one-piece assembly.

The additional lens mentioned above may comprise two zones transforming the horizontal transverse axis wave surface from the reflector into two cylindrical wave surfaces of different vertical axes.

According to an alternative embodiment to that in which the recuperating reflector is of ellipsoidal type, the recuperating reflector may be of the hyperbolic type, the second focus of such a reflector being virtual, located behind the recuperating reflector. The lens then has in the upper edge zone an additional lens, according to the same terminology as before.

Advantageously, this recuperator reflector of the hyperbolic type transforms the spherical wave coming from the first light source into a cylindrical wave, in particular of transverse axis, forming a line of second foci. And the additional lens then modifies the cylindrical wave of transverse axis either in a plane wave, or in a cylindrical wave of substantially vertical axis.

Moreover, the light-emitting diodes used in the context of the present invention are preferably plane emitter, in particular rectangular, protected by a transparent element of the transparent dome type. It is also possible to use planar emitting diodes, in particular rectangular, protected not by a dome but by a flat transparent plate.

• Fig. 1 est une coupe schématique verticale avec parties arrachées d'un ensemble de modules optiques selon l'invention.
• Fig. 2 est une vue de droite par rapport à Fig. 1 de l'ensemble de modules.
• Fig.3 est un schéma illustrant l'éclairement obtenu avec un projecteur selon l'invention.
• Fig. 4 est une coupe verticale schématique d'une variante du module additionnel et de la lentille.
• Fig. 5 est une coupe schématique verticale du module additionnel selon une réalisation préférée avec réflecteur récupérateur de type ellipsoïdal.
• Fig. 6 est une vue schématique en perspective de dessus et de l'arrière du réflecteur et de la lentille d'un module additionnel selon Fig. 5.
• Fig. 7 montre, semblablement à Fig. 6, une variante de réalisation avec lentille de type lentille de Fresnel pour le module additionnel.
• Fig. 8 est une vue schématique de dessus de deux modules additionnels avec illustration des surfaces d'onde,
• Fig. 9 illustre le réseau de courbes isolux obtenu avec la combinaison du module code et du module additionnel,
• Fig.10 est un schéma illustrant un calcul
• Et Fig.11a, 11b est une représentation en sections selon deux plans différents d'une variante du module de la figure 5, où le réflecteur récupérateur est cette fois de type hyperbolique.

The invention consists, apart from the arrangements described above, in a certain number of other arrangements which will be more explicitly discussed hereinafter with regard to exemplary embodiments described with reference to the appended drawings, but which are not in no way limiting. On these drawings:

• Fig. 1 is a vertical schematic section with torn parts of a set of optical modules according to the invention.
• Fig. 2 is a right view with respect to FIG. 1 of the set of modules.
• Fig.3 is a diagram illustrating the illumination obtained with a projector according to the invention.
• Fig. 4 is a schematic vertical section of a variant of the additional module and the lens.
• Fig. 5 is a vertical schematic sectional view of the additional module according to a preferred embodiment with an ellipsoidal recovery reflector.
• Fig. 6 is a schematic perspective view from above and from the rear of the reflector and the lens of an additional module according to FIG. 5.
• Fig. 7 shows, similarly to FIG. 6, a variant embodiment with a Fresnel lens type lens for the additional module.
• Fig. 8 is a schematic view from above of two additional modules with illustration of the wave surfaces,
• Fig. 9 illustrates the network of isolux curves obtained with the combination of the code module and the additional module,
• Fig.10 is a diagram illustrating a calculation
• And Fig.11a, 11b is a representation in sections in two different planes of a variant of the module of Figure 5, where the recuperator reflector is this time hyperbolic type.

Referring to Fig. 1, we can see a bright projector P for a motor vehicle, horizontal optical axis, having at least one module to give a code-type cut-off beam. Each code module comprises a first light source 1 formed by a light-emitting diode, called LED by abbreviation, arranged to illuminate forwards, a first reflector 2 of ellipsoidal type placed in front of the source 1 to mask it and to return the light to the light source. rear, and a second reflector 3 offset vertically with respect to the light source 1 and the first reflector 2. A bender 4, generally formed by a plane mirror, is provided in combination with the ellipsoidal reflector 2 to create the cutout code beam . The second reflector 3 receives the light coming from the reflector 2 and returns it towards the front. The reflector 3 is preferably of the parabolic type.

The LED 1 is advantageously of the flat rectangular emitter type protected by a transparent dome.

According to the representation of FIG. 1, the source 1, and the reflectors 2 and 3 are arranged in the upper part of the projector P. In the lower part, there is a fairly similar arrangement with a LED 1 ', an ellipsoidal type reflector 2' and a reflector type 3 'parabolic. This lower part contributes to increasing the luminous flux of the code beam (oblique cut).

The light sources 1 and 1 'of the module are arranged on the same printed circuit board (PCB) 5 whose plane is inclined from back to front with respect to the vertical, so that the sources 1 and 1' illuminate upwards and forward.

The horizontal strip located in front of the convex rear faces of the reflectors 2, 2 ', and vertically between the reflectors 3, 3' constitutes a neutral band, available for an optical function.

The complete module P is generally constituted by several modules Ha, Hb, Hc (FIG.2) similar to that of FIG. 1, juxtaposed in the transverse direction corresponding to the axis Ox of a trirectangular trihedron whose axis Oy coincides with or parallel to the optical axis of the projector, and the axis Oz is vertical. The light sources of the various modules Ha, Hb, Hc are arranged on the same printed circuit board 5, which facilitates manufacture.

The complete module P comprises, according to the invention, at least one additional module A making it possible to produce a complementary beam which, combined with the coded beam, gives a road beam satisfying not only the regulatory requirements but also gives a light of atmosphere. Such a beam allows the driver to see in height and, at night, to have a driving impression similar to that of day.

The scheme of FIG. 3 illustrates this point. The cutoff line 6 of the code beam is a V line comprising a horizontal branch 6a to the left of the optical axis O _y , perpendicular to the figure plane, and an oblique branch 6b rising to 15 ° on the horizontal, in part right with respect to the optical axis. When the code function is provided, the horizontal line of the cutoff 6 is located approximately 0.5 ° below a horizontal plane B passing through the optical axis. When controlling the road function, conventional means (not shown) are activated so that the beam of the headlamp is raised by about 1.5 ° so that the horizontal cutoff line 6 is about 1 ° above the horizontal plane B.

In order for the produced beam to fulfill the regulatory requirements imposed on a road beam, it suffices to add to the beam code raised a substantially rectangular beam 7 so that the imposed regulatory points, generally located in the vicinity of the optical axis, and respectively to 2 , 5 ° and 5.1 ° on either side of the optical axis, have sufficient illumination. The beam 7 substantially corresponds to a light spot and gives a deep illumination allowing the driver to see far ahead.

The additional module A comprises at least one second light source 9 illuminating forwards, without being masked by the first reflectors 2 or 2 'and a lens 10 situated in front of the second source 9. The lens 10, in general, is convergent, and the second source 9 is located at the focus of the lens 10, or in its vicinity.

The second source 9 is formed by at least one LED installed on the same circuit board 5 as the other light sources 1, 1 'of the projector. The LED 9, including a rectangular planar emitter protected by a transparent dome, associated with the lens 10 allows to produce the beam 7 (Fig.3) substantially rectangular.

However, this additional beam 7 does not sufficiently illuminate objects at height such as trees 8, panels, buildings, along the road, so that the driver has a similar impression of driving that he knows of day.

The additional module A, according to the invention, is provided to provide a room light in a substantially semicircular contour K (FIG. 3), in a vertical plane perpendicular to the optical axis, in order to illuminate the parts high on the sides of the road. Preferably the illumination is provided upwardly at an angle of at least 10 ° above the horizontal (for example between 12 and 20 °). For this purpose, the additional module A comprises a light-recovery reflector M turned forward and offset, of vertically, relative to the contour of the lens 10. This recuperator reflector M comprises at least one focus in the vicinity of which is disposed the second light source 9 so that at least a reflected part of the light rays from the source 9 so the projector in an upward direction relative to the horizontal. The ascending rays pass beyond the outline of the lens to create the mood light.

According to the embodiment of Fig.1, the recuperating reflector M is a parabolic reflector 11. The lens 10 is truncated at 10a in its upper part to let the rays providing the ambient light. The source 9 is arranged in such a way that the focus of the reflector M is on a point of this source 9 located near the lower edge of the source 9. A light ray i1 starting from the point of the source 9 coincides with the focus of M will be reflected by M along a radius ρ1 parallel to the optical axis Oy of the projector P. A ray i2 from a point of the source 9 located higher than the focal point of the reflector M will, after reflection, a radius ρ2 ascending relative to the horizontal, contributing to the ambient light.

In front view, that is to say in a right view with respect to FIG. 1, each second source 9 is shifted transversely relative to the sources 1, 1 'and generally arranged in staggered rows. The additional module or modules A are arranged in front of the neutral band located in front of the reflectors 2, 2 'and vertically between the high and low limits of the code modules.

The solution of Fig.1 and 2 provides for upward illumination in addition to the prescribed road beam, but the truncated upper portion 10a of the lens creates an appearance break that is best avoided.

For this, as illustrated in FIG. 4, there is provided a lens 12 which, in the upper part, is continuous and has a neutral zone 12a whose outer face is in the extension of the outer face of the lens 12. The inner face of the zone 12a is substantially parallel to the outside face. The thickness of the neutral zone 12a is smaller than that of the lower part of the lens 12 so that a recess 12b is present on the inner face of the lens at the base of the neutral zone 12a. This neutral zone 12a is substantially equivalent to a parallel-sided blade and a light beam coming from the reflector M passes through the neutral zone without being substantially deflected, but undergoes a transverse offset parallel to itself.

According to the two embodiments corresponding to FIGS. 1 and 4, an observer located in front and looking from above the projector can see, inside the projector, the second light source 9, part of the circuit printed 5 and the convex portion of the first reflectors 2, 2 ', either through the neutral zone 12a, or through the free space between the truncated portion 10a (Fig. 1) and the reflector M. The visibility of the Inside the projector is, in general, not desired for the style.

In addition, the parabolic-type reflector 11, in particular with a complex surface, has a relatively short focal length, determined by the position of the second source 9, and does not collect a large luminous flux.

To improve these different points, according to a preferred solution illustrated in FIG. 5 and 6, the recuperating reflector M is constituted by a reflector 13 of ellipsoidal type having a first focus F1 located near the upper edge of the source 9, and a second focus F2 located in the air in front of the reflector 13, but This lens 14 comprises a convergent lower main portion 14a similar to the lens 10 or to the lower part of the lens 12. The lens 14 furthermore comprises, in the upper part, an additional lens 14b, converging according to FIG. example of FIG. 5. The additional lens 14b, unlike a neutral zone, prevents seeing clearly through it from the outside. It is the same for the part 14a, or for the lens 10 and the lower part of the lens 12.

The outer surface of the additional lens 14b is in continuity with the outer surface of the portion 14a so as to avoid any appearance breakage. By against a stall 14c exists between the input face of the portion 14a and the input face 14e of the additional lens 14b, which forms a kind of gadroon.

The exit face of the additional lens 14b is imposed by the continuity of the exit face of the portion 14a. The input face 14e of the additional lens 14b is calculated so that the focus of this lens 14b coincides with the focus F2, or neighboring this focus. The light rays reflected by the reflector 13 which pass through the focus F2 and by the focus of the lens 14b exit horizontally as the radius j3 from the reflected ray ρ3 and the incident ray i3. An incident ray such as i4 from a point of the source 9 located lower than the focus F1 is reflected along a radius p4 which passes below the focus F2. The radius p4 is refracted according to a radius j4 ascending with respect to the horizontal. These ascending rays create the ambient light allowing the driver to see in height.

In the example of FIG. 5, the additional lens 14b is convergent and the focus F2 is located behind this lens.

We could have a divergent additional lens in which case the focus F2 would be in front of this lens. The ellipsoidal reflector 13 would then be more enveloping by extending further forward.

The position of the second focus F2 in a direction parallel to the optical axis is an optimization variable.

The upper part of the reflector 13 forms a notch 13a (Fig.6) concave. One can provide a horizontal plate 13b closing the notch 13a and mechanically connecting the reflector to the lens. The plate 13b may be provided with a reflective coating downward. The assembly is then one-piece and can be molded in one piece of suitable transparent plastic material, with deposition of an aluminum layer on the surfaces to be reflective.

Preferably, the reflector 13 is not a true ellipsoid but is determined so as to create a focal line perpendicular to the plane of FIG. 5 and passing through point F2.

The reflector 13 thus creates cylindrical wave surfaces of horizontal axis perpendicular to the plane of FIG. 5 and passing through point F2.

In Fig. FIG. 8 shows diagrammatically, in plan view, two juxtaposed reflectors 13 and two sources 9, combined with the same lens 15 formed by the juxtaposition of two lenses 14, with additional lenses 14b, symmetrical with respect to a vertical plane V parallel to the optical axis passing between the reflectors 13. The horizontal focal lines D of the reflectors 13 are aligned. Each focal line D passes through the focal point F2 of the corresponding reflector 13, and the successive traces of cylindrical wave surfaces of axis D, on the horizontal plane, are constituted by straight generatrices g1, g2, g3 parallel to D.

According to the scheme of FIG. 8, the lens 15 extends in front of the two juxtaposed reflectors 13. The lens 14 assigned to the reflector 13 located at the top in FIG. 8, the other lens being deduced by symmetry relative to the plane V. This lens 14 comprises in the upper part an additional lens 14b having two zones, namely a zone 14ba remote from the plane V and a zone 14bb close to the plane V, as illustrated in perspective on FiG.6 and 7.

The zone 14ba is designed to create, at the output, a cylindrical wave surface of vertical axis. The trace of this vertical axis on the horizontal plane passing through the optical axis is a point ma relatively close to the plane V. The zone 14bb gives a cylindrical wave surface of vertical axis having as a trace, on the same horizontal plane, a point mb further from the plane V and the lens 14b than the point ma. The Na wave surfaces corresponding to the zone 14ba have a lower radius of curvature than the wave surfaces Nb corresponding to the zone 14b.

Fig. 6 shows, in perspective, the zones 14ba, 14bb. The height h of the additional lens 14b is relatively small, in particular equal to 6 mm or 7 mm.

Referring to Fig. 7, a Fresnel lens type lens 14 'having a reduced thickness in the central zone can be seen. The substantially vertical edges 14f of the lens are thicker than the central region, with the formation of an off-hook 14g.

Fig.9 illustrates the network of isolux curves obtained with the road function of a projector according to the invention. This network has illumination curves C1, C2 rising above the horizontal plane of the optical axis, advantageously at an angle of approximately 10 ° relative to the horizontal, sufficient to provide ambient light. . These curves C1, C2 have two lateral vertices reminiscent of the form of ears. The central zone C3 corresponds to the spot of the road beam and the maximum long-range illumination.

A projector according to Fig.5 to 8 can be determined as follows.

Optical principle (reflector 13 + special zone or additional lens 14b, at the top of the lens 14):

The reflector 13 creates an "image" of the source 9 extending along and below a horizontal immaterial line, perpendicular to the optical axis and located between the mirror and the lens (right D (F, x ). The lens 14b transforms a hypothetical cylindrical wave from the previous line into a cylindrical wave of vertical axis (with the particular case of the plane wave).

More precisely, the reflector 13 returns a family of limit radii coming from the upper edge of the emitter or source 9 towards the line (F, x ), perpendicular to it.

où L _s est la largeur de l'émetteur, supposé centré horizontalement sur le repère.We see that if the limit rays are chosen properly, this system creates a cut (flat), without cache or bender (the light is above the cut). The choice of the position ma, mb of the axis of the output wave makes it possible to choose the spreading of the beam (radius of the cylinder) and the angular position of the maximum of intensity (position in x of the intersection of the axis of the cylinder with the plane z = 0). However, the determination of good limit radii in the case of a transmitter 9 covered by a non-planar protective dome involves heavy numerical resolutions for each calculated point; as it is not necessary (even undesirable) to create a very sharp low cut in the case of a complementary road beam, it is possible here to neglect the horizontal deflections due to the transparent balloon, covering the source 9, for the "limit" rays (parallel to the optical axis) reaching the reflector 13 in the zone at $$X\in \left[\begin{array}{cc}\mathrm{-}\frac{{\mathrm{The}}_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{\mathrm{2}}\mathrm{,}& \frac{{\mathrm{The}}_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{\mathrm{2}}\end{array}\right],$$

where L _s is the width of the transmitter, assumed centered horizontally on the mark.

Under these conditions, it is possible to calculate beforehand the limit radii (approximate for a part of them) and to use this family as the basis of a mesh for the calculation of the reflector 13; the rays considered can also be directly and therefore simply propagated through the balloon.

(θ est l'angle formé entre le rayon partant du foyer, atteignant le réflecteur, réfléchi au foyer F2 et atteignant le bas de la surface 14 e et un plan horizontal) $$F_{\mathrm{s}}=\left(\begin{array}{c}{}^{{\mathit{L}}_{\mathrm{s}}}{/}_2\\ 0\\ 0\end{array}\right)\mathrm{et}{\overrightarrow{r}}_1=\left(\begin{array}{c}\sin \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \cos \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \sin \left(t\right)\end{array}\right),\mathrm{pour}t\in \left[\mathrm{\theta }\mathrm{,}\frac{\mathrm{\pi }}{\mathrm{2}}\mathrm{+}\mathrm{\omega }\right]\mathrm{et\; \phi }\mathrm{\in }\left[\begin{array}{cc}0,& \frac{\mathrm{\pi }}{\mathrm{2}}\end{array}\right]$$

$$F_{\mathrm{s}}=\left(\begin{array}{c}{}^{{-\mathrm{L}}_{\mathrm{s}}}{/}_2\\ 0\\ 0\end{array}\right)\mathrm{et}{\overrightarrow{r}}_1=\left(\begin{array}{c}\sin \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \cos \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \sin \left(t\right)\end{array}\right),\mathrm{pour}t\in \left[\mathrm{\theta }\mathrm{,}\frac{\mathrm{\pi }}{\mathrm{2}}\mathrm{+}\mathrm{\omega }\right]\mathrm{et\; \phi }\mathrm{\in }\left[\begin{array}{cc}\mathrm{-}\frac{\mathrm{\pi }}{\mathrm{2}}\mathrm{,}& \mathrm{0}\end{array}\right]$$

The limit radii considered are of the form ( F _s , r ₁ ,), where: $$F_{\mathrm{s}}=\left(\begin{array}{c}x\\ 0\\ 0\end{array}\right)\mathrm{and}{\overrightarrow{r}}_1=\left(\begin{array}{c}0\\ \cos \mathrm{\left(}t\right)\\ \sin \left(t\right)\end{array}\right),\mathrm{for}x\in \left[-\frac{{\mathit{The}}_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{2}\mathrm{,}\frac{{\mathit{The}}_{\mathrm{<figure-callout\; id="2"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{2}\right]\mathrm{and}t\mathrm{\in }\left[\begin{array}{cc}0,& \frac{\mathrm{<figure-callout\; id="2"\; label="\pi "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\pi </figure-callout>}}{\mathrm{2}}+\mathrm{\omega }\end{array}\right]$$

(θ is the angle formed between the radius from the focus, reaching the reflector, reflected at the focus F2 and reaching the bottom of the surface 14 e and a horizontal plane) $$F_{\mathrm{s}}=\left(\begin{array}{c}{}^{{\mathit{The}}_{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{/}_2\\ 0\\ 0\end{array}\right)\mathrm{and}{\overrightarrow{r}}_1=\left(\begin{array}{c}\sin \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \cos \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \sin \left(t\right)\end{array}\right),\mathrm{for}t\in \left[\mathrm{\theta }\mathrm{,}\frac{\mathrm{<figure-callout\; id="2"\; label="\pi "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\pi </figure-callout>}}{\mathrm{2}}\mathrm{+}\mathrm{\omega }\right]\mathrm{and\; \phi }\mathrm{\in }\left[\begin{array}{cc}0,& \frac{\mathrm{\pi }}{\mathrm{2}}\end{array}\right]$$

$$F_{\mathrm{s}}=\left(\begin{array}{c}{}^{{-\mathrm{The}}_{\mathrm{<figure-callout\; id="0"\; label="s"\; filenames="imgf0001.png"\; state="\{\{state\}\}">s</figure-callout>}}}{/}_2\\ 0\\ 0\end{array}\right)\mathrm{and}{\overrightarrow{r}}_1=\left(\begin{array}{c}\sin \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \cos \mathrm{\left(}\mathrm{\phi }\mathrm{\right)}\cos \mathrm{\left(}t\right)\\ \sin \left(t\right)\end{array}\right),\mathrm{for}t\in \left[\mathrm{\theta }\mathrm{,}\frac{\mathrm{<figure-callout\; id="2"\; label="\pi "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\pi </figure-callout>}}{\mathrm{2}}\mathrm{+}\mathrm{\omega }\right]\mathrm{and\; \phi }\mathrm{\in }\left[\begin{array}{cc}\mathrm{-}\frac{\mathrm{<figure-callout\; id="2"\; label="\pi "\; filenames="imgf0001.png"\; state="\{\{state\}\}"><figure-callout\; id="0"\; label="\pi "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\pi </figure-callout></figure-callout>}}{\mathrm{2}}\mathrm{,}& \mathrm{0}\end{array}\right]$$

Since the dome is supposed to be centered at S , located δ _s below the surface of the emitter (δ _s ≈ 0.1 mm in the case of commercially available diodes), it is possible to propagate the above rays to the diopter inside the balloon (equation of the second degree to find the intersections), to calculate the direction of the corresponding refracted rays using the laws of Descartes (the normal to the balloon is always collinear with the vector: S - intersection), to propagate these rays refracted in the material of the balloon (index n known, given by the manufacturer of the LED) to the outer spherical surface (again, polynomial equation of the second degree to find the points of emergence) and to determine the directions of emerging rays (laws of Descartes, passage material → air) .

où k est une constante et P ₂ + λr ₃ est l'intersection du rayon et de la surface du réflecteur.
L'équation précédente implique : $${\left(P_{2\mathrm{y}}+\mathrm{\lambda }{r}_{3y}-F_y\right)}^2+{\left(P_{2\mathrm{z}}+\mathrm{\lambda }{r}_{3z}-F_z\right)}^2={\left(k-n{\mu }_2-{\mu }_1-\mathrm{\lambda }\right)}^2,$$

d'où on tire λ et donc un point du réflecteur recherché.Let P _{2 be} an emergence point and r ₃ a unit director vector of the corresponding radius, ie μ ₁ the distance traveled by the radius of F _s at its intersection with the inner surface of the balloon and μ ₂ the distance traveled in the material of the balloon ( μ ₁ and μ ₂ are the solutions second degree equations mentioned above), one must have: $$\mathit{<figure-callout\; id="2"\; label="distance\; \; P"\; filenames="imgf0001.png"\; state="\{\{state\}\}">distance\; </figure-callout>}\left(P_{}\right)\left({}_2+\mathit{\lambda }{\overrightarrow{r}}_3,\mathrm{right}\left(F\overrightarrow{x}\right)\right)+\mathrm{\lambda }+\mathrm{not}{\mathrm{<figure-callout\; id="2"\; label="\mu "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\mu </figure-callout>}}_2+{\mathrm{<figure-callout\; id="1"\; label="\mu "\; filenames="imgf0001.png,imgf0006.png"\; state="\{\{state\}\}">\mu </figure-callout>}}_1=k,$$

where k is a constant and P ₂ + λ r ₃ is the intersection of the radius and the surface of the reflector.
The previous equation implies: $${\left({\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="imgf0001.png"\; state="\{\{state\}\}">P</figure-callout>}}_{2\mathrm{there}}+\mathrm{\lambda }{r}_{3\mathrm{there}}-F_{\mathrm{there}}\right)}^2+{\left({\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="imgf0001.png"\; state="\{\{state\}\}">P</figure-callout>}}_{2\mathrm{z}}+\mathrm{\lambda }{r}_{3z}-{\mathrm{<figure-callout\; id="2"\; label="F\; z"\; filenames="imgf0001.png"\; state="\{\{state\}\}">F\; </figure-callout>}}_z\right)}^2={\left(k-\mathrm{not}{\mu }_2-{\mu }_1-\mathrm{<figure-callout\; id="2"\; label="\lambda "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\lambda </figure-callout>}\right)}^2,$$

from which we draw λ and therefore a point of the sought reflector.

on cherche t, tel que la droite
(P₂ (x= 0,t), r ₃ (x= 0,t)) passe par U (résolution numérique de $$\left(\begin{array}{c}\mathit{uʹ}\cos \left(\mathrm{\omega }\right)-P_{2z}\end{array}\right)\mathrm{.}{r}_{3y}=\left(\begin{array}{c}\mathit{uʹ}\sin \left(\mathrm{\omega }\right)-P_{2y}\end{array}\right)\mathrm{.}{r}_{3z}$$

en fonction de t).To determine k , knowing an imposed point (see Fig.10) $$U=\left(\begin{array}{c}0\\ -\mathit{u\text{'}}\sin \left(\mathrm{\omega }\right)\\ \mathit{u\text{'}}\cos \left(\mathrm{\omega }\right)\end{array}\right),$$

we seek t , such as the right
( P ₂ ( x = 0, t ), r ₃ (x = 0, t )) passes through U (numerical resolution of $$\left(\begin{array}{c}\mathit{u\text{'}}\cos \left(\mathrm{\omega }\right)-{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="imgf0001.png"\; state="\{\{state\}\}">P</figure-callout>}}_{2z}\end{array}\right)\mathrm{.}{r}_{3\mathrm{there}}=\left(\begin{array}{c}\mathit{u\text{'}}\sin \left(\mathrm{\omega }\right)-{\mathrm{<figure-callout\; id="2"\; label="P"\; filenames="imgf0001.png"\; state="\{\{state\}\}">P</figure-callout>}}_{2\mathrm{there}}\end{array}\right)\mathrm{.}{r}_{3z}$$

according to t).

The clearance u 'is a design parameter; however, it must be chosen so that U is located beyond the edge of the component housing.

Then k = μ ₁ + n μ ₂ + P ₂ U + distance (u, right (F, x )), for μ ₁ , μ ₂ and P ₂ , in x = 0, corresponding to the value of t found

Calculation of the additional lens 14b:

est un vecteur normal à la surface en Γ.Let R and r be the radii of the torus constituting the exit surface, and let T be the ordinate of the most forward point of this surface (parameters of conception): a parametric equation of the surface is, with R the major radius of the torus and r the minor radius of the torus: $$\mathrm{\Gamma }=\left(\begin{array}{c}{\mathrm{X}}_{\mathrm{\Gamma }}\\ Y_{\mathrm{\Gamma }}\\ {\mathrm{Z}}_{\mathrm{\Gamma }}\end{array}\right)=\left(\begin{array}{c}(\mathrm{R}+\mathrm{AROP}\phi )\sin \theta \\ (\mathrm{R}+\mathrm{AROP}\phi )\cos \theta +\mathrm{T}\mathrm{-}\mathrm{R}\mathrm{-}\mathrm{r}\\ \mathrm{rsin}\phi \end{array}\right),\mathrm{or}{\overrightarrow{\mathrm{not}}}_{\mathrm{s}}=\left(\begin{array}{c}\mathrm{cos\phi sin\theta }\\ \mathrm{cos\phi sin\theta }\\ \mathrm{sin\phi }\end{array}\right)$$

is a normal vector at the surface at Γ .

et on peut calculer le rayon réfracté correspondant (lois de Descartes) :
soit r son vecteur directeur, on cherche P= Γ + λr point de la surface d'entrée à calculer.Let (( C _x , C _y , O), z ) the axis of the emergent cylindrical wave surface, we consider the radius coming from Γ reaching this surface, which is propagated in the opposite direction: this ray, has a director vector $$\overrightarrow{\mathrm{i}}\mathrm{=}\left(\begin{array}{c}{\mathrm{VS}}_{\mathrm{x}}\mathrm{-}{\mathrm{X}}_{\mathrm{\Gamma }}\\ {\mathrm{VS}}_{\mathrm{there}}\mathrm{-}{\mathrm{<figure-callout\; id="0"\; label="Y\; \Gamma "\; filenames="imgf0001.png"\; state="\{\{state\}\}">Y\; </figure-callout>}}_{\mathrm{\Gamma }}\\ \mathrm{0}\end{array}\right)$$

and we can calculate the corresponding refracted radius (laws of Descartes):
is r its vector director, one seeks P = Γ + λ r point of the entrance surface to be calculated.

avec k une constante
où n est l'indice du matériau de la lentille (pas nécessairement le même que celui du dôme de la LED utilisé lors du calcul du réflecteur) et où σ = -1 si l'axe de la surface d'onde émergente est situé derrière la surface de sortie de la lentille (du même côté que la source) et σ = +1 dans le cas contraire.
(L'équation précédente peut être ramenée à une équation du second degré en λ).The optical path constant is written between the output wave surface and the source cylindrical surface (of axis ( F , x )): $$\sigma \times \sqrt{{\left({\mathrm{there}}_{\mathrm{r}}\mathrm{-}{\mathrm{VS}}_{\mathrm{there}}\right)}^{\mathrm{2}}\mathrm{+}{\left({\mathrm{x}}_{\mathrm{\Gamma }}\mathrm{-}{\mathrm{<figure-callout\; id="2"\; label="VS\; x"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}}_x\right)}^{\mathrm{2}}}\mathrm{+}\mathrm{not}\mathit{\lambda }\mathrm{+}\sqrt{{\left({\mathrm{there}}_{\mathrm{\Gamma }}\mathrm{+}{\mathit{\lambda }\mathrm{r}}_{\mathrm{there}}\mathrm{+}{\mathrm{F}}_{\mathrm{there}}\right)}^{\mathrm{2}}\mathrm{+}{\left({\mathrm{z}}_{\mathrm{,}\mathrm{r}}\mathrm{+}{\mathrm{\lambda r}}_z\mathrm{-}{\mathrm{<figure-callout\; id="2"\; label="F\; z"\; filenames="imgf0001.png"\; state="\{\{state\}\}">F\; </figure-callout>}}_z\right)}^{\mathrm{2}}}$$

with k a constant
where n is the index of the lens material (not necessarily the same as that of the dome of the LED used when calculating the reflector) and where σ = -1 if the axis of the emerging wave surface is behind the exit surface of the lens (on the same side as the source) and σ = +1 otherwise.
(The preceding equation can be reduced to a second degree equation in λ).

k is determined by the data of the thickness e _p in the center of the lens at a given height

h: taking into account the notations below, we determine h _o and δ

• h est la hauteur au dessus de l'axe optique pour laquelle, dans le plan de la figure 5, l'épaisseur de la lentille 14b est égale à ep, h et ep étant des grandeurs de dimensionnement et pouvant être choisies arbitrairement
• h_o est la hauteur au dessus de l'axe optique du point d'émergence d'un rayon provenant du foyer F2 et atteignant la surface 14 e à une hauteur h au dessus de l'axe optique,
• δ est la distance le long de l'axe optique entre le point de hauteur h _o au dessus de l'axe optique et le point de hauteur h au dessus de l'axe optique, sur la face de sortie de la lentille 14.

h, h _o and δ are defined as follows:

• h is the height above the optical axis for which, in the plane of FIG. 5, the thickness of the lens 14b is equal to ep, h and ep being Sizing quantities that can be chosen arbitrarily
• h _o is the height above the optical axis of the point of emergence of a ray coming from the focus F2 and reaching the surface 14 e at a height h above the optical axis,
• δ is the distance along the optical axis between the point of height h _o above the optical axis and the point of height h above the optical axis, on the exit face of the lens 14.

(D et h ₁ sont des paramètres de conception) h _o and δ are determined for the section of Figure 5, at x = 0 (AO represents, in Figure 5, the optical axis of the module)
then we have: $$K=\mathrm{not}\sqrt{{\left(e_p-\mathrm{<figure-callout\; id="2"\; label="\delta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\delta </figure-callout>}\right)}^2+{\left(h-{\mathrm{<figure-callout\; id="2"\; label="h\; o"\; filenames="imgf0001.png"\; state="\{\{state\}\}">h\; </figure-callout>}}_o\right)}^2}+\sqrt{{<figure-callout\; id="2"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">\ell </figure-callout>}^2+{\left(F_z-\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="imgf0001.png"\; state="\{\{state\}\}">h</figure-callout>}\right)}^2}+\mathrm{\sigma }\sqrt{({\mathrm{VS}}_{\mathrm{there}}-\left(D+e_p-\left(\sqrt{{\mathrm{<figure-callout\; id="2"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}^2+{\mathrm{<figure-callout\; id="0"\; label="h"\; filenames="imgf0001.png"\; state="\{\{state\}\}">h</figure-callout>}}_0^2}\right)\right))+{\mathrm{VS}}_{\mathrm{x}}^2}$$

( D and h ₁ are design parameters)

Dimensioning:

Having fixed the design parameters D, l, h ₁ , h ₂ , h, e _p and u and knowing ω and the dimensions of the source, we determine the position of F and the value of θ, by imposing on the reflector of n illuminate only the dedicated area of the lens. For this, we make a first approximation study, in vertical section by x = 0, without taking into account the protective dome of the source (which allows us to consider that the section of the reflector is an elliptical arc).

This study makes it possible to determine F _z and θ (which are essential for the other calculations) and to try to adjust the dimensioning parameters, within reasonable ranges, in order to minimize θ, which can be considered as a measure of the flux captured (the smaller θ is, the larger the recovered flow).

An alternative module according to FIG. 5 is now described with the help of FIGS. 11a, 11b: in this variant (of which only the modified characteristics with respect to the variant according to FIG. 5 will be described in detail), the recuperating reflector M is a hyperbolic mirror. A hyperbolic mirror indeed makes it possible to image the real source situated at the first focus of the hyperbola with a virtual point situated at the second focus of the hyperbola. In the same way that the ellipse of figure 5 imagined the source with a line of focus, it is possible to use a hyperbolic mirror which images the source with a line of virtual hearths. More precisely, a ray i3 coming from the real source is reflected by M in such a way that the reflected ray r3 seems to come from the point F2, the second focus of hyperbole. In this case, it is then necessary for the upper part of the lens 14'b to be able to transform the spherical wave issuing virtually from F2 into a plane wave or a cylindrical wave. In the same way, when the mirror conjugates the source with a segment of foci, the lens will have the function of transforming the cylindrical wave coming from the segment into a plane wave or a cylindrical wave with vertical direction. Specifically, the radius r3 from the reflector is straightened by the lens to start in the direction of the optical axis.

According to this variant, it is possible to extend the recuperator mirror M to the upper edge of the lens and thus recover a larger amount of flux, thus making it more "enveloping" with respect to the light source. In addition, for some orientation of the LED, the recovery mirror collects luminous flux in directions where the intensity from the source is the strongest. Another advantage of this variant lies in the nature of the upper part of the lens: On the one hand, its focal length is longer than in the variant according to FIG. 5, which makes its realization easier, on the other hand, it is possible to ensure continuity - at least in the center - between the upper part of the lens and the lower part. If there is a discontinuity at certain points, the step may be smaller than that required in the context of the variant according to FIG.

The rays 15 directly from the source and reaching the upper portion 14'b of the lens come from a point in front of the focal point of this lens portion. They emerge from the lens by starting upwards. In order to optimize their trajectory, judicious cutting between high and low lenses can be done. For this, it is necessary to estimate the areas of the lens that receive a significant amount of light from the mirror M recuperator. It is in this area that we will place a focused lens at home F2 while the rest of the lens will focus on the source itself. Given the presence of the LED, it is understood that the center of the lens - on a particular radius of about 6 to 10 mm- receives a small amount of radius from the mirror.

Figure 11b details the "border" between "high" lens and "low" lens: The horizontal plane passing through the source cuts the lens in two parts (high and low). A cylinder with an axis coinciding with the optical axis passing through the source and with a radius of between 4 and 15 mm also cuts the lens. The lower portion added to the inside of the cylinder corresponds to a first lens portion 14'a focused on the source. The upper part, by not taking into account the inside of the cylinder, corresponds to a second lens portion 14'b focused on the focus F2.

This variant according to FIG. 11 advantageously authorizes the use of a lens output face common to the portions 14'a and 14'b without any discontinuity of tangency or even of curvature. Only a discontinuity of surface remains between the input faces of the lens portions 14'a and 14'b (discontinuity which can also be limited or even canceled in at least one point, for example in the center, by judiciously choosing the thicknesses of the lens portions 14a with respect to 14b).

Claims (24)

Optical module (P) for a motor vehicle headlamp, of substantially horizontal optical axis, comprising at least one module for providing a cut-off beam, this module comprising at least a first light source (1,1 ') comprising at least one diode electroluminescent device, characterized in that : said module (P) also integrates at least one additional module (A) with at least one second light source (9) formed by at least one light-emitting diode illuminating forwards and a lens (10; 12; 14; 15); located in front of the second source to produce a complementary beam (7) which, combined with the cut-off beam, gives a driving beam, and the additional module (A) comprises a light-recovery reflector (M) facing forward and upwards, this recuperating reflector comprising at least one focus, and the second light source (9) is located with respect to this focus such that at least a portion of the light rays from the source exiting the module (P) is reflected by the light-recovering reflector (M) in an upward direction (ρ2, j4) with respect to the horizontal, in particular to create a mood light in the road beam. Optical module (P) according to the preceding claim, characterized in that the lens (10; 12; 14; 15) works partly in direct light emitted by the second light source (9) and partly in indirect light emitted by the second light source (9) then reflected by the light-recovering reflector (M). Optical module (P) according to one of the preceding claims, characterized in that a first part of the rays emitted by the second light source (9) is reflected by the light-collecting reflector (M) and then passes through the lens (10; 12; 14; 15), and a second portion passes directly through said lens. Optical module (P) according to the preceding claim, characterized in that a third part of the rays emitted by the second light source (9) is reflected by the light-recovery reflector (M) and then leaves the module avoiding the lens (10). ; 12; 14; 15), Optical module (P) according to one of the preceding claims, characterized in that the light-recovering reflector (M) converts a substantially spherical light wave into a substantially cylindrical or toric light wave. Optical module (P) according to one of the preceding characteristics, characterized in that the light-recovering reflector (M) is of substantially hyperbolic type and capable of transforming a substantially spherical wave into another substantially spherical wave. Optical module (P) according to one of the preceding claims, characterized in that the portion of the light rays originating from the source reflected in an upward direction (ρ2, j4) with respect to the horizontal to create a mood light in the road beam exits the module (P) through the lens (10; 12; 14; 15). Optical module (P) according to one of the preceding claims, characterized in that the portion of the light rays originating from the source and reflected in an upward direction (ρ2, j4) with respect to the horizontal to create a mood light in the output beam of the module (P) avoiding the lens (10; 12; 14; 15), especially passing over the lens. Optical module (P) according to one of the preceding claims, characterized in that the first source (1,1 ') illuminates forwards and the oblique beam module (P) comprises: a first reflector (2, 2 ') placed in front of the first light source (1, 1') to mask it and to send the light backwards, and a second reflector (3, 3 ') offset with respect to the light source and the first reflector, this second reflector receiving the light reflected by the first reflector and sending it forward to give the oblique cut beam, and the second light source (9) is outside the space facing the first reflector (2, 2 '). Optical module assembly according to one of the preceding claims, characterized in that it comprises a plurality of obliquely cut modules (Ha, Hb, Hc) juxtaposed transversely and that the or each additional module (A) is located in a neutral band in front of the obliquely cut modules, this neutral band being comprised vertically between the high and low limits of the obliquely cut modules. Optical module assembly according to the preceding claim, characterized in that it comprises a plurality of first light sources (1,1 ') and a plurality of second light sources (9) arranged in staggered relation with the first light sources (1,1') of the modules oblique cut. Module according to one of the preceding, characterized in that the forward-facing light-collecting reflector (M) is offset vertically with respect to the lens (10, 12, 14). Module or module assembly according to one of the preceding claims, characterized in that the or each light-emitting diode (9) of the additional module is arranged on the same printed circuit (5) as the other light-emitting diode (s) (1, 1 '). ) of the module (P). Module or module assembly according to one of the preceding claims, characterized in that the first and second light sources (1, 1 ', 9) are inclined to illuminate upwards while illuminating forwards. Module or module assembly according to one of the preceding claims, characterized in that the upper part (10a) of the lens is truncated for the passage of the rays of the ambient light, the recuperating reflector (M) is of the paraboloid type (11), located higher than the lens (10), and the focus of the reflector (11) is located near the lower edge of the light source (9) so that the points of the source located higher than the focus give ascending rays (ρ2) after reflection on the recuperating reflector (M). Module or set of modules according to one of the preceding claims, characterized in that the upper part of the lens (12) has a neutral zone (12a) for the passage of the rays of the ambient light, the recuperating reflector (M ) is of the paraboloid type (11), located higher than the lens (12), and the focus of the reflector is located near the lower edge of the the light source (9) so that the points of the source situated higher than the focus give ascending rays (p2) after reflection on the recuperating reflector. Module or module assembly according to one of the preceding claims, characterized in that the recuperating reflector (M) is of the ellipsoidal type (13) with a first focus (F1) located on the second light source (9), and a second focal point (F2) located in front of the air, and the lens (14) has in the upper edge zone an additional lens (14b), the outer face of which is in continuity with that of the lens (14), while its inner face is in particular determined so that the focal point of the additional lens is coincident with the, or neighbor of, the second focus (F2) of the recuperating reflector (13). Module or module assembly according to the preceding claim, characterized in that the ellipsoidal recuperator reflector (M) (13) is determined to give a horizontal focal line (D) substantially orthogonal to the optical axis leading to a surface of cylindrical wave of horizontal transverse axis, while the additional lens (14b) is determined to transform this wave surface into a cylindrical wave surface of vertical axis. Module or module assembly according to claim 17 or 18, characterized in that the ellipsoidal recovery reflector (13) is connected to the lens by a plate (13b) at the top to form a one-piece assembly. Module or module assembly according to one of claims 17 to 19, characterized in that the additional lens (14b) has two zones (14ba, 14bb) transforming the horizontal transverse axis wave surface from the reflector into two surfaces. cylindrical waves (Na, Nb) of different vertical axes. Module or module assembly according to one of the preceding claims, characterized in that the recuperating reflector (M) is of the hyperbolic type (13 '), and in that the lens (14') has in the upper edge zone a lens additional (14'b). Module or set of modules according to the preceding claim, characterized in that the recuperator reflector (M) of the hyperbolic type transforms the spherical wave from the first light source (1,1 ') into a cylindrical wave, in particular of transverse axis , forming a line of second homes. Module or set of modules according to the preceding claim, characterized in that the additional lens (14'b) modifies the cylindrical wave of transverse axis in a plane wave or a cylindrical wave of substantially vertical axis. Module or module assembly according to any one of the preceding claims, characterized in that the light-emitting diodes are emitter, in particular rectangular, plane and protected by a transparent dome-type element or plate.

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